辽宁省侵蚀沟发育特性及地形分异特征

发布时间：2018-03-21 02:54

本文选题：土壤侵蚀　切入点：侵蚀沟地形分异　出处：《水土保持学报》2017年05期 　论文类型：期刊论文

【摘要】：在不同层面对研究区数字高程模型(DEM)重分级,探讨地形因素对侵蚀沟发育的影响。以第一次全国水利普查侵蚀沟普查成果(2010年)与辽宁省第五次土壤侵蚀普查侵蚀沟普查成果(2015年)获取侵蚀沟分布数据,基于1∶50 000DEM获取侵蚀沟高程、坡度、坡向、坡长和空间分异特征。在地理信息系统(GIS)和遥感(RS)技术的支持下,分析辽宁省侵蚀沟发育特性与地形分异特征。结果表明:5年间研究区侵蚀沟密度增加0.02km/km~2,侵蚀沟高发区主要集中在辽西;70%以上区域密度变化值50m/km~2,大部分处于微度增加区;高程在325~350m时密度变化值最大;坡向上南坡、西南坡为密度变化高值区;坡度在1.5°~15°时密度变化曲线呈抛物线形,1.5°和15°时无明显变化;坡长在600~800m时密度变化值最大,坡长1 000m时密度变化值无明显差异。
[Abstract]:The digital elevation model (DEM) of the study area was reclassified at different levels. The effects of topographic factors on the development of erosion gullies were discussed. The distribution data of erosion gullies were obtained from the results of the first national water conservancy census (2010) and the 5th soil erosion census (2015) in Liaoning Province. Based on 1:50 Dem, the characteristics of elevation, slope, direction, length and spatial differentiation of erosion ditch are obtained. Supported by GIS (Geographic Information system) and RS (remote Sensing), The characteristics of erosion gully development and landform differentiation in Liaoning Province were analyzed. The results showed that the density of erosion ditch increased by 0.02 km2 / km2 in the study area during the past five years, and the high incidence area of erosion trench was mainly concentrated in the area with a density of more than 70% in western Liaoning Province, most of which were in the increasing area of micro-degree. The density change value is the largest at 325 ~ 350m, the density change is high at the south slope and the southwest slope, the density change curve shows no obvious change at 1.5 掳~ 15 掳, and the density change value is the biggest when the slope length is 600800m, the density change curve is not obvious when the slope is 1.5 掳~ 15 掳, and the density change value is the biggest when the slope length is 600 ~ 800 m. There was no significant difference in density change when slope length was 1 000 m.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金项目“东北黑土低山丘陵区融雪侵蚀机理与过程研究”(41371272)
【分类号】：S157.1

【相似文献】